During "The Faculty", at the beginning, when the teachers have the conference, and Miss Drake goes back for her keys before getting stabbed in the hand by coach Willis. We all see her stabbed in the hand, the right hand. Then when she is trying to open the window and runs for the door at the end of the sequence, she is holding up her left hand covered in blood.

I watched the Faculty last night to check on this slip up. Miss Drake gets stabbed in the hand, the left hand, and she holds the left hand up throuh out this scene. She doesn't change hands. But all of the other slip ups do actually happen.